How long should the fiber optic cable remain after splicing
After splicing, fiber optic cables should have sufficient slack—typically 20–30 cm per fiber—to allow proper coiling, protection, and future re-termination.
Slack and Preparation Length
The length of fiber left after splicing depends on the type of enclosure, splice tray, or termination device being used. Generally, each fiber should have enough slack to be coiled in the splice tray without exceeding the minimum bend radius, which is usually around 4 cm for single-mode fibers . This ensures that the fiber is not stressed, preventing microbends or breakage that could increase signal loss. For most field installations, 20–30 cm of fiber per splice is recommended to allow for proper routing, heat-shrink sleeve placement, and future maintenance . In cases with special devices like splitters or pigtails, additional slack may be required to accommodate coiling and heat-shrink protection without overlapping or sharp bends .
Coiling and Management
After splicing, fibers should be coiled along the natural direction of the loose tube or cable branch. Coiling should be done carefully to avoid sharp bends, small loops, or fiber crossing, which can cause additional loss or damage . Use the reserved space in splice trays efficiently, employing circular, elliptical, or "CC" shaped coils to maximize space and maintain fiber integrity .
Special Considerations
- Heat-shrink sleeves should be placed first in the tray, followed by coiling the remaining fiber on both sides to protect the splice joint .
- Excessively long fibers can be coiled separately at the end of the tray, while short fibers should be handled carefully to avoid tension .
- OTDR monitoring is recommended after coiling to ensure that the splice quality is maintained and no additional loss has been introduced due to fiber handling . By following these guidelines, the fiber optic cable will remain protected, maintain low insertion loss, and allow for future re-termination or network modifications without compromising performance .
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